From BES to BIS in a Bold

I just bought a BB Bold. I work for an organization that uses Microsoft Exchange, and in addition I have other 2 e-mail addresses I regularily review. While setting up my BB Bold yesterday, I took the BES road but as I am not in my office now, the BB Bold can not conect to the Server as we dont handle virtual machines to connect to the server when away from office desk. After doing that, and trying to have access in my BB, I uninstalled the Desktop Software, and reinstalled it again under the BIS system. Now I feel that my BB Bold is running under BES while my desktop Software is doning it under BIS. I just need advice as what to do to be able to work in my office with the exchange server, as well as when out from office to receive and answer e-mail messages from my company address, and the other 2 private addresses I have. Thanks,